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1. It's overkill in Spain, probably -10 too, since there should be some kind of heating in most open albergues, and -10 temperatures are rare outside, even on February.
2. Albergues have mattresses. Unless you sleep outside (ie. tent), not needed. You might want some kind of sheets.
3...
Wild boar can be a problem. Specialy during heat season. Just today I walked up and found several boars close to my camping site. I decided it was best to pickup the hammock and sack and leave the area ASSAP. And it wasn't the only group I found this night .
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